On my 2009 Fit Sport MT, I've noticed that when accelerating under 2500rpm there's a noise. It's not really a rattle, but maybe like something is not tight. But it seems to go away after I get above 2500rpm.

Does anyone have any idea what this might be and if it's something I could be concerned about?

Thanks for your help.

 

Oil pressure/viscosity? V-tec?

 

It is a V-tec. What is your thought there?

🤔 the oil indicator says oil life is 80% and there are no other oil indicators and the oil looks really clean.

 

Heat shield? A/C compressor? Water pump? Belt tensioner? Do some investigating while the car is on...

 

I have a 2010 sport with a similar issue. I'm not sure if your sound is the same as mine but mine kind of "buzzes" or "rattles" around 2800 rpm. It's like a metallic sound. I have seen other posts about it being the heat shields, particularly the ones on the back of the engine near the firewall and the ones near the resonator and cat. They apparently rust around the bolts and loosen up. Mine aren't rusted so that's not it for me but this did solve other peoples problems. Unfortunately I didn't get this fixed yet even after almost 4 years with the car but I did notice that the tops of the heat shields on the exhaust tend to collect large amounts of gravel that gets stuck up there and makes quite a bit of noise. its one thing you could check out at least.

 

I would recommend going to a local auto parts store and telling an employee you need a stethoscope. 1/4" diameter or around there, vacuum or fuel hose. pop an earplug in one ear and hold the hose up to the other.
have a friend hold her at the suspected RPM and listen.
if its engine noise, (correct me if im wrong) it shouldnt matter if the car is actually driving. This should allow you to decipher if its internal or external noise.. by just listening to isolated areas.

check the exhaust, by the spark plugs too. itd be an interesting thing if their crush washers were buzzing for you.
. if it comes up not giving you hints, consider things that have been serviced/replaced once, and re-torque them. you name the system and i can provide the specs. got em for the v-tec too.
there's no reason such a thing should go undiagnosed, unless you've got money to burn

 

How many miles are on the vehicle?

 

I have an 09 and have a very similar sound and it also goes away after 3k rpm or so. It also only happens when the AC is on. I am assuming that my compressor is going out and will need to be replaced before next summer. Does yours only sound that way when the AC is on?

 

There are about 110k miles on it.

 

@Fusensho Sounds very similar to what mine is doing.

@Pyts I did a little bit of investigating while parked and it appears that the noise goes faster as the RPMs increase and until it is either gone or indistinguishable from the other engine noise at 1800 - 2500rpm.

 

Have your engine supports checked..

 

This car is very noisy, however it takes a trained ear to pinpoint the exact sound you are talking about.. While driving my Fit around I hear about 1000 different noises going on from road noise, engine noise, exhaust noise, the CD player spinning noise, the AC expansion valve opening and closing during on/off cycles, fans cycling on/off, on top of the 100 other random cabin noises from door panel to door panel. Even the small rocks / debris that hits the under wheel wells of the car and under you when you drive over water.

 

After thoroughly reading everyone posts and what they are describing.. it is the AC expansion valve that you guys are hearing.. its the sounds of the schwooching, squishing, of the pressurized gases of HFC-R134a, right behind the dash.

The device usually look something like this. They tend to fail around 60k, 90k, 120k depending on your AC usage (the more the better) Usually 120k is when these start to go bad, that's when your AC works only when its cold outside, or cool outside, and only when been sitting in the garage. If its sitting outside and your AC is not cold.. in the summer heat.. its usually this device that is the culprit. Its what regulates the gas pressures based on thermal expansion of the metals. Overtime the expansion properties of the metal will cease to exist. Thus not regulating the pressures correctly.

 

My Fit does a smilar noise from 1500 to 2000 or so RPM. I can only hear it hardly sometimes around 100% silent environments accelerating until 2000 rpm and letting the pedal off , paying attention to the noise ( This is when it sometimes gets to your ears). Some mechanics can hear, some others can not. The ones who can hear think it could be engine knocking or oil pump or water pump or something like that. It`s getting close to one year since it first appeared and the noise did not increase nor decrease. I need to leave the car in a good mechanic and i will post the results here.

 

I hope your answer might be what I'm looking for. I drive a Honda Fit 2012 LX and earlier this year, I would hear a slight chirping noise once in a while when I step on the accelerator. It sounded like it was coming through my air vents above my CD player. I think I started hearing the noise around the 120K mark. It would come and go and then it disappeared for a couple of months during the summer. I also felt that my AC wasn't as cold as it used to be but I blamed our hot summer.

Now the noise is back when I accelerate (but not necessarily each time) and along with it, my car now chirps when I'm idle at a light.

I've had my belt replaced a few days ago and when that didn't solve the problem, the mechanic checked everything that could possibly make this chirping/squeaking noise but still hasn't figured it out.

These noises don't start right away though. Only 10-15 minutes into driving when the car is warm.

I've provided a sound file. Does this sound like what you're talking about? It starts off with me accelerating (faster chirp) then being idle for most of the clip and then accelerating again in the end. https://www.dropbox.com/s/y13t7jiqus6tv1c/car%20squeak.m4a?dl=0

Hope you can solve this annoying mystery!

 

Thats unfortunately not conclusive.. I mean, if yer in the cab for the recording it sounds like the blower fan that circulates air in the cabin.. Vent! fan. Do you change your cabin air filter as needed? could see that fan going goofy if it was forced to draw all that air through a straw so to speak.. a good indicator there could be a somewhat froggy odor from a/c. one good dust cloud could coat that filter.

With that nixed, for purpose of being thorough, id recommend checking engine coolant level.. it didnt sound like a water pump to me but
what would be left is.. assuming the belt and tensioner are good.. the pulley wheels. could remove the serpentine belt and spin them by hand feeling for a squeak inducing drag. could get good information there also by watching the serpentine belt do its thing and making sure theres no wobble at any wheel (some bounce is acceptable at the tensioner, but due to strength of said tensioner it'd be minute).
eliminating pulley wheels would leave radiator and ac fans.

could be isolated with the infinitely regurgitated method of putting a hose in your ear and holding the other end up to a fan motor as it ran (the motor being the center of said fan whats where the wiring connects)..

the fact that it manifests at idle should well eliminate suspension and the pitch strikes me as too high for any heavy mechanisms..

moving down the list of suspects... nah. thats 10 minutes worth of ideas. Crew?

 

My fit has some grinding type noise when I’m up at 25mph when I let off gas it goes away when I press the gas pedal it comes on.. I’ve replaced water pump,belt,tensioner,tranny fluid new axles oil change every 30% & I have 165k it’s auto but I drive it about 100 miles back and forth to work daily drives perfect though any ideas it’s getting annoying

 

Not a very thoughtful diag on my part but check the PCV valve. Crankcase pressure kinda spikes when you let off the pedal. Can also check fluids again just to verify :}

 

i will check it out to see what happens I always try to have my fit in tip top shape because of my commute like to treat it right I have a video of it

 

Did you ever figure out the issue with your car?